Crystal 1.0.0-dev breaks several QGraphicsItem subclasses

[HertzDevil]

Crystal 1.0 strengthened checks on abstract def implementations, so the classes Qt::GraphicsSimpleTextItem, Qt::GraphicsPixmapItem, and Qt::GraphicsTextItem will fail there. The reason is that the corresponding C++ method declarations have different default values for the widget argument:

class QGraphicsItem
{
public:
    virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr) = 0;
};

class QGraphicsPixmapItem : public QGraphicsItem
{
public:
    // no default value for widget
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
};

// ditto for QGraphicsSimpleTextItem and QGraphicsTextItem

Other subclasses like Qt::GraphicsLineItem work because the default values match:

class QGraphicsLineItem : public QGraphicsItem
{
public:
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr) override;
};

For now the workaround is to redefine the offending methods whenever the module is included:

module Qt
  class GraphicsSimpleTextItem
    def paint(painter : Painter, option : Binding::QStyleOptionGraphicsItem*, widget : Widget? = nil) : Void
      Binding.bg_QGraphicsSimpleTextItem_paint_QPainter_X_const_QStyleOptionGraphicsItem_X_QWidget_X(self, painter, option, widget)
    end
  end

  class GraphicsPixmapItem
    def paint(painter : Painter, option : Binding::QStyleOptionGraphicsItem*, widget : Widget? = nil) : Void
      Binding.bg_QGraphicsPixmapItem_paint_QPainter_X_const_QStyleOptionGraphicsItem_X_QWidget_X(self, painter, option, widget)
    end
  end

  class GraphicsTextItem
    def paint(painter : Painter, option : Binding::QStyleOptionGraphicsItem*, widget : Widget? = nil) : Void
      Binding.bg_QGraphicsTextItem_paint_QPainter_X_const_QStyleOptionGraphicsItem_X_QWidget_X(self, painter, option, widget)
    end
  end
end

Without these redefinitions, those methods would take a plain widget : Widget argument, and Crystal will complain about missing implementations, e.g. Error: abstract `def Qt::GraphicsItem#paint(painter : Painter, option : ::Pointer(Binding::QStyleOptionGraphicsItem), widget : Widget | ::Nil = nil)` must be implemented by Qt::GraphicsSimpleTextItem.